Add manifest links and hack to index on revision.

common/proto/milo/annotations.proto

Index: common/proto/milo/annotations.proto
diff --git a/common/proto/milo/annotations.proto b/common/proto/milo/annotations.proto
index a77a82f0f0dca6e7c4b5c97c2ddf18dd3141d2aa..b9bfe53608b457464aeba06dc197da12dd7e376c 100644
--- a/common/proto/milo/annotations.proto
+++ b/common/proto/milo/annotations.proto
@@ -137,6 +137,27 @@ message Step {
     string value = 2;
   }
   repeated Property property = 24;
+
+  // Links to a recipe_engine.Manifest proto.
+  message ManifestLink {
+    // The fully qualified (logdog://) url of the Manifest proto. It's expected
+    // that this is a binary logdog stream consisting of exactly one Manifest
+    // proto.
+    string url = 1;
+
+    // The hash of the Manifest's raw binary form (i.e. the bytes at the end of
+    // `url`, without any interpretation or decoding). Milo will use this as an
+    // optimization; Manifests will be interned once into Milo's datastore.
+    // Future hashes which match will not be loaded from the url, but will be
+    // assumed to be identical. If the sha256 doesn't match the data at the URL,
+    // Milo may render this build with the wrong manifest.
+    string sha256 = 2;
+  }
+
+  // Maps the name of the Manifest, e.g. UNPATCHED, INFRA, etc. to the
+  // ManifestLink. This name will be used in the milo console definition to
+  // indicate which manifest data to sort the console view by.
+  map<string, ManifestLink> source_manifests = 25;
 }
 
 // A Link is an optional label followed by a typed link to an external